The check for new updates keeps trying if there isn't a internet connection. In my case I had 216 popups on a PC that was doing some automated printing saying "Could not connect to the update server" as well as about 100 Windows errors saying that he couldn't launch another instance of PDFCreator...
Would be better that he didn't try anymore if there is already a popup shown...
Rem: I run the normal version, not the server installation
However... this option is also available from the standard user interface of PDFCreator... so it wasn't the problem to put this off... but even if it is on, it shouldn't try 216 times in a few hours... and certainly shouldn't show 216 dialogs saying it didn't work :-)...